net: network-state monitor and permanent-rejection FPLMN (v2.7.0)

server:
- netsim: LOCI/PSLOCI dummy builders take a status; the EPSLOCI dummy is
  wiped to 0B F6 + FF per UICC_NAA.md C3; roaming_denied now emulates the
  permanent 'PLMN not allowed' rejection (C3a): status 010, EPSNSC dropped,
  EF.FPLMN append with TS 31.102 4.2.16 shift semantics and a home-PLMN
  guard (HPLMNwAcT/EHPLMN, IMSI fallback), optional 'Rejection: write FPLMN'
  toggle; write steps carry the logical key; SCENARIO_SERVICE map;
  insert_fplmn/fplmn_entries/parse_imsi helpers
- netstate.py: cached per-session monitor state for the 12 network EFs,
  step-based patch, simulated service state, derived location with country/
  operator (optional MCC/MNC list) and roaming class
- server: monitor read at equip right after a readable ICCID (skipped
  otherwise), cleared on card removal; GET /api/net-state and POST
  /api/net-state-refresh; net-sim patches the cache from the written bytes
  and re-reads EF.IMSI; Location-status events set the service state and
  re-read EF.IMSI (multi-IMSI applets)

frontend:
- Phone tab: 'Network state' panel next to Network simulation with the
  simulated service badge (Undefined until simulated; normal/limited/no
  service + rejection marker), location/roaming line, compact per-file
  summaries with full-decode tooltips and a Refresh button; no card polling
- EF decoders: EF.FPLMN (FFFFFF gaps are not terminators) and EF.EHPLMN
- i18n EN/RU, help updated; SW cache simple-v203

tests: 295 Python / 453 frontend

frontend/help.html

@@ -483,13 +483,16 @@
 	<ul class="list-disc list-inside text-sm space-y-1 mb-3">
 		<li><strong>Cold boot</strong> — invalidate EPSNSC (KSI 07, key wiped) and dummy the location files.</li>
 		<li><strong>EPS attach / 2G attach</strong> — store a real EPS NAS context (KSI, KASME, NAS counts, algorithm) and write real LOCI/PSLOCI/EPSLOCI (2G also writes real Kc/KcGPRS).</li>
-		<li><strong>Service lost / Limited service / Roaming denied</strong> — send the Location status event (only when the card subscribed to it), invalidate EPSNSC (optionally keeping the old KASME), dummy the location files (PLMN kept, LAC <code class="font-mono text-sm">FFFE</code>, status <code class="font-mono text-sm">01</code>/<code class="font-mono text-sm">02</code>) and invalidate Kc.</li>
+		<li><strong>Service lost / Limited service / Roaming denied</strong> — send the Location status event (only when the card subscribed to it), invalidate EPSNSC (optionally keeping the old KASME), dummy the location files (PLMN kept, LAC <code class="font-mono text-sm">FFFE</code>, status <code class="font-mono text-sm">01</code>) and invalidate Kc. <strong>Roaming denied</strong> emulates a permanent &ldquo;PLMN not allowed&rdquo; rejection (NAS cause #11): the location files carry status <code class="font-mono text-sm">010</code> (EPSLOCI wiped to <code class="font-mono text-sm">0B F6</code> + status), the denied VPLMN is appended to <strong>EF.FPLMN</strong> with the shift-list semantics of TS 31.102 §4.2.16 (never the home PLMN) and the key context is dropped.</li>
 		<li><strong>Churn</strong> — replay real → invalid EPSNSC records back-to-back (count and delay configurable).</li>
 		<li><strong>SMS received</strong> — bump the EF.SMSstatus counter (read-modify-write) and optionally rewrite the location files.</li>
 		<li><strong>CB reconfig</strong> — write the CBMI/CBMIR message-ID lists or clear them (all FF).</li>
 		<li><strong>AUTHENTICATE</strong> — send AUTHENTICATE (3G/EPS/5G, <code class="font-mono text-sm">00 88 00 81 22</code>) with the given or random RAND/AUTN and show the response (success <code class="font-mono text-sm">DB</code> or synchronisation failure <code class="font-mono text-sm">DC</code> with AUTS).</li>
 	</ul>
-	<p class="text-sm mb-3"><strong>Parameters</strong> (collapsed) provide the operator (searchable worldwide MCC/MNC list served from the server, plus a random roaming picker), LAC/Cell ID/TAC/RAC, optional identity values (empty = random: TMSI, GUTI, KSI, KASME, Kc, NAS counts, algorithm, RAND/AUTN), the scenario toggles and the churn count/delay. The step log lists every write, ENVELOPE and AUTHENTICATE with its SW. Only UPDATE BINARY/RECORD, ENVELOPE and AUTHENTICATE are sent — FPLMN and 5GS location files are never written (no observed phone does); the writes change the card and are visible to later snapshot comparisons.</p>
+	<p class="text-sm mb-3"><strong>Parameters</strong> (collapsed) provide the operator (searchable worldwide MCC/MNC list served from the server, plus a random roaming picker), LAC/Cell ID/TAC/RAC, optional identity values (empty = random: TMSI, GUTI, KSI, KASME, Kc, NAS counts, algorithm, RAND/AUTN), the scenario toggles (including <strong>Rejection: write FPLMN</strong>) and the churn count/delay. The step log lists every write, ENVELOPE and AUTHENTICATE with its SW. Only UPDATE BINARY/RECORD, ENVELOPE and AUTHENTICATE are sent — FPLMN is written only by the permanent rejection scenario (TS 31.102 §4.2.16) and the 5GS location files are never written; the writes change the card and are visible to later snapshot comparisons.</p>
+
+	<h4 id="network-state" class="font-medium mb-1">Network state monitor</h4>
+	<p class="text-sm mb-3">Next to the simulation buttons a compact <strong>Network state</strong> panel shows what the card currently holds and what was last simulated. Its header carries the <strong>simulated service state</strong> — <em>Undefined</em> until a scenario or a Location status event sets it, then <em>Normal service</em> (green), <em>Limited service</em> (amber) or <em>No service</em> (red), with a red <em>PLMN not allowed</em> marker when the location files or EF.FPLMN show a rejection — plus the current <strong>location</strong>: PLMN, country and operator (from the optional worldwide MCC/MNC list when loaded), the LAI/RAI/TAI, and the <strong>roaming class</strong> (<em>Home</em> when the PLMN equals the HPLMN, <em>Home equivalent</em> when it is in EF.EHPLMN, otherwise <em>Guest</em>). Below it, one compact line per monitored file (IMSI, EHPLMN, SPDI, HPLMNwAcT, LOCI, PSLOCI, EPSLOCI, EPSNSC, CBMI, CBMIR, SMSstatus, FPLMN) with its decoded summary and how it was last updated (<code class="font-mono text-sm">init</code>, <code class="font-mono text-sm">write</code>, <code class="font-mono text-sm">read</code>, <code class="font-mono text-sm">refresh</code>); hover for the full decoded fields. The panel reads the files once at equip (only when the ICCID was readable), updates them in place from the bytes the simulator wrote, re-reads EF.IMSI after every scenario and Location-status event (multi-IMSI applets) and never polls the card — use <strong>Refresh</strong> to re-read all files on demand.</p>
 
 </section>